Turbocompressor



Aug. 211, m3.

F. LOSE-IL.

TURBOGOMPRESS OR Filed March 51, 1921.

Fig.1

In WW2 w? Patented Aug. 23, 3%23.

TUBOCDMPRESSGR.

Application files March 31, 1821. Serial Ito. 457,814

To all whom. it may concern:

Be it known that I, FRANZ Losnn, a citizen of the Czecho-Slovak Republic, residing at Brunn, Czechoslovakia, have invented certain new and useful Improvements in Turbocompressors, of which the following is a s ecification.

y invention refers to centrifugal compressor such as turbo-compressors and blowers and to centrifugal pumps, and its particular object is to increase the eflicie'ncy of such devices.

As is well known to those skilled in the art, I

centrifu al compressors (turbo-compressors and turbo-blowers) as well as centrifugal pumps are known to possess the property of pumping when working in the vicinity of the hi hest point of their characteristics. The eddies which originate in connection with this phenomenon, give riseto shocks; besides, the consumption of power is unstable, i. c. it permanently fluctuates between two value without ever becoming constant within the pumping zone. The reason for this is found in the form of the characteristic.

of the compressor or the like, inasmuch as under certain circumstances two widely different deliveries may belong to one and the same back-pressure in the characteristic, in conse uence of which the two cases must also difier widely is regard to the consumption of power.

Three ways are customary for obviating or reducing this phenomenon which is exceedin ly troublesome in practical work:

1. A teration of the number of revolutions on reaching the vicinity of the pum ing zone, thus raising the characteristic.

2. Blowing ofi through a no-load passage, resulting in the total resistance decreasing, whilst the useful pressure increases, the compressor thus being caused to work at a greater distance from the pumping zone.

tion and forming part thereof, a tur 0 compresscr embodying my invention is illus trated diagrammatically by way of example. In the drawings Fig. 1 is an elevation'of the compressor, whilst Fig. 2 is a diagram of the pertinent characteristics.

Referring to the drawings, I is a normal multiple-stage turbo-compressor, having a characteristic represented for instance b the curve marked a (Fig. 2). ()n the she t of the compressor Z there is fixed an auxiliary single-stage turbo-compressor II which is separated from I by a partition and a labyrinth packing d, the characteristic of this second compressor II being predetermined in such a manner that the quantity of the medium undergoing compression, which is delivered by I at any given moment, is subjected to a certain additional compression, the characteristic of this auxiliary compressor having for instance of the curve 71 (Fig. 2).

In normal worklng the pressure chamber of the auxiliary compressor 11 communicates with the suction piping of the main the shape compressor I through the agency of the sluice valve V whilst the valve V remains closed. Thus the auxiliary compressor 11 runs in the suction pressure of the main compressor and only delivers the small quantity of air penetrating through the packing d, the power consumed by the auxiliary compressor being quite insi ificant. During this time the sluice valve 4 is open, whilst V is shut off all these valves being arranged to be manuall operated, and the main compressor is wor ing normally.

When however the main compressor reaches the vicinity of the pumping zone, valve V and V are opened, whilst V and V are shut off. The compressed medium, delivered by the main compressor is now subjected to further compression by the auxiliary compressor II, thus raising the characteristic of the main compressor so as to make the characteristic a of the whole compressor set pass over in the original exact details thereof. The term compressor used in the claims appended to this specification is meant to include pumps and blowers.

I claim v 1. The combination, with a centrifugal compressor, of means for raising its characteristic in the vicinity of the zone where pumping is likely to occur.

2. The combination, with a centrifugal compressor, of an auxiliary centrifugal compressor arranged to raise the characteristic of said first compressor in the vicinity of the zone where pumping is likely to occur.

3. I11 a device of the kind described in combination, a main centrifugal compressor, an auxiliary centrifugal compressor ar ranged on the pressure side but separated from said main compressor and means for connecting said compressors in series.

4. In a device of the kind described in combination, a multi-stage and a singlestage compressor on one shaft, a partition between said compressors, a valve in said partition, an inlet in front of said auxiliary compressor, a separate outlet to the rear of each compressor, and means for closing said inlet and said outlets.

In testimonywhereof I aflix my signature.

FRANZ LClSEL; 

